Chuck



A. .L LAvolE 'Mai ' HUGH Filed-neg. 2v 191s a sheets-sheet 1 Inventor' y By trat'ed finrthef eccompa,

' l a considerable range is 'insured in the usev Patented 'May `8, 1923.

onwennig etienne;

emmen? r i Bemitfknownwthait I,- ALP'HONSE? loser-H LAVOIE, a ysubject oftlier-Kingfjof 'Greet4 Brit; ain, and residing et294fWilsoniAvenue, in

thecitly andvdistrictoi: Montreal, inithe Proiri'nfcewfofE f Quebecg inirthef'fDominion ot Genade;L havefinventedefrf-new und useful .Chuck-,vof= which i'thefefolloWing-.is the speci# icationzp` I' j The invention irelztes-eto"fclnicksizis4` deJ 'scribed in the present specicetionlandfillusnyingdrawirigs ythat fornrpert"ofthe'semegv f'The:inventionfconjsistsY essentially of the novelfxmeans "employed:.'forfedjusting the jews-ete the particular Work'end'fforiengeg` ing the "Work :when 'finally' adj usted', whereby off chucks' pneumatically' operated,` and` the Work gripped with greetffaic'ilit 7'e `ness/endreadilyfreleasedif The objects fof thefinventi'onfarej to' 'devise in'fma'chinery "a, :work holder "that" will be economical .to :use: tli'e metter' :of- `'sturing time andwlabour inuadJusting 4and gripping operations gsto elimineteslipping 'during `ithe teringf 'of seid apiece; to s im sp'ener'ally' to..` provi-'de 3U turning of. anyf'piece;andffacilitete the een# pli'/ithe parts in lathe attachmentsvand' a, comparatively". cheapgfdurable: and. 'etlicient chuck; H YIn thedrawings;Figureel` is a longitudi;

' l nel:sectionalview'othe chuckshowingboth' arjan', "adjusting member 'and' e gripping);I

member-"aswell" asl the"4 generali arrangement f of-,the pneumatic' means yfor" operating.

van

plan 'View ofthe" jaW heed e i mi.

` screw plug in the adjusting mechanism.

Figure 7 is a. ton head.

Figure 8 is a longltudinal sectional View showing e plain form ofk piston; Ywhile the perspective detail of the/pisother parts remain identical vWith the corresponding1 parts of the other gures.

Figure 9 is e; sectionaldetail showing the jaw recesses and locking grooves,

nd i tiran# J forme plugholefl base'hblo'ckfl 14 the baisidejwof'fthe body. "1 e Lilie 'numerals' of! re spending' parts; in' ea,

of the, machine innen vside 2g to., form cesses 'i4 fb'efing Triade5 eontaiiningthe bosses 'tohfskprings i B'tWeen-"t fcefsses 6 nndfoinin 'V "formed" for* the l hereinafter. 'The jzviiisfy r'tlhree grippin fer-ably.

z 1 the threaded?y recess' v; These? blocks' f are" fortified.

- curved, longitudinal adjusting screws.

across lund Sere 'inflin The 'dogs V 1 9 'het fewer' f in i nuirrber,`

I f tweenithe befr tee't 20 are 'also inclined7 ff dogs with thefb-locks posts 24 also extend fr the sockets 22,.and are posts '5. -Thesprings 5 and the post piston toits inward p the said springs norm engagement.

The piston 23 is int recess 2, the latter f the machine.. .The Cyl R'efferringto thev dral s 24,' and normall een Sewing niemeer ferenceindiciltecorri-y 1-,liej1ii1nl 3, further ref in the b ottomifof the eine. A prefned*E direction',1 there''i :met,Streghewenn@ i onv the face of the piston23. The. 100 om th vin alignment with the 25'encircle the posts y. keep the osition`,`thet is to sly', 10Q

ally keep the jaws from il oductedl into the inner ming the cylinder. `of ieder is' dosed-by the llo Tior which" is" recessed y1in the 11- stem 175 epistonfbetween'` head 26 and a face plate 27 covers the head 26, both being secured to the rim 3 by the screws 28. The iace plate 27 .has a central threaded spindle orifice 29, into which the hollow spindle 30 is screwed, and the head 26 is shown in Figure 1 with a central threaded oriice 31, into which is inserted an extension cup 32 having the air orice 33 at the end thereof connected to the eed pipe 34.

The inner extension cup 35 is screwtliread'ed into the piston 23 and is slidably.

arranged in the body 1 in alignmenty with the work hole 36. The cup 35 orv like member forms a dust shield guarding the various parts oi the device and also forms a 1 guide andwork recess. v

final grip is made pneumatically throughy In the screw plug holes 17, screw plugs i 43er bushings form bearings for the-adjusting screws 44, the latter having the circu-` lar reduced vheads45 turning in said bushings and formed with thesquared driving holes 46. n

The outer ends 47 of the screws abut the the stops 16 ,and said screws engage the inner threaded recesses 13 of the jaws 8,-con'se-` quently by inserting a driving tool in the driving holes 46, the jaws are manually adjusted yto their inner or: outer positions to grip or to release the work,` and the thedogs19. f In-order to more edectually explain thev invention, the operation will now be described briefly. The body, through its connection with the face plate, is mounted on the spindie of the lathe and the work is inserted between several jaws, that is to say, either one of the step jaws. These jaws are brought up to the work by operating the adjustingV screws 44, as the actual jaws move independently of the base blocks in the manual operation.

The next stepis to turn on ,theV air, and this has the effect of sending' the piston 'forn wardly and consequently the dogs 19. The

dogs 19, through their teeth -20, wedge at the base blocks 14 through their vteeth 18, and as the base blocks and jaws are. intimately associated and outside of" the manual adjustment travel coincidently, the said jaws 8 are firmly andV vork and held there so long as the air pressure is maintained, but immediatelyV that the air is exhausted, the jaws automaticallly release themselves from the work, for the springs 25 return the piston to its original non-actingg,` position in thecylinder 'and in consequence,of course, thek dogs are broughty quickly brought to the to i back', which produces the automatic disens gagemeiit 'from the work.

-Various changes may be made inv the de-- tails oit the construction `without departing from the spirit of the invention, and so long,r as these changes are within thefscope of the claims for novelty-following, the .protec-v tion accorded shall not benvalidated. What I claim is L t 1. A chuck 4comprisingv a body and a plu- V rality of radially movable jaws, jaw'. bases slidable in said body yin combination with a` reciprocating member carrying jawoperating dogs havingvan inclined engagement with said jaw bases, said dogs liai'fing ak ra-f dial sli p-in engagement with said reciprocating` member and a longitudinal sliding engagement with the chuck body guiding and niaintainingthe line 'of movement. of said dogs parallelwith the axis of said chuck.

2. in a chuck, a vbody having an inner recess forming a cylii'idrical chamberand spring` recesses in the bed of said chamber and radial jaw slotsinivardly fromv the outerl face, a; head closing said cy inder and haviv ing a cup extension,l screw-threaded there-vv f into, andan air inlet into said cup extension,

an air feed` pipe connected to said inlet,`a face plateV rigidly secured to said body" through said headv and having a suitable mounting` orificea piston operating in said cylinder and carrying centrally ajcup eX- tension operating inthe aforesaid cup ei;-A

tension land sliding` in said bodyopposite the work hole, wedging .dogs securedto said piston and jaws having wedging faces coactingwith said dogs and slidably arranged in,l said radial slots.

Signedat thecity of Montreal, Quebec,`

Canadmithis 9th day of December,1919.

Atri-ionen Josnri-i Lavora; 

